Java and development study
A post introducing the JSON-B Java API that’s going to be part of Java EE 8, which is expected to ship toward the end of 2017.
The post is at Java Indeed blog.
To see more of the forthcoming Java EE 8, which will be followed by Java EE 9, subscribe for the current issue of the Oracle Java Magazie, here.
And that’s all…
There are a few operations that processes a stream and output stream as source for terminal operations. Above, we can see some of these methods, yours descriptions and examples. Just short, just directly.
I’m very excited about studying Javascript on the mission of expand my knowledges at front-end. The principal goal is use Javascript at my Java back-end projects.
So, two things I really liked on javascript so far is:
The first concept lets a array be used as params of methods, on a very easy and functional way.
The second one helps on format messages that uses dynamics values, as variables. We can just reference the value inside a string pattern, marked with the ` character.
See the example…
How it works?
Tthere’s a input x, like sentence from review, a classified MODEL that generates the output, y. The predicted class, like positive or negative reviews.
Applications:
Multiclass Classifier: input (x) webpages and classifiers (y) like education, sport, health, IT and so on.
Spam filtering: by model classification of email input variables like text of email, ip, sender, etc. To output of classifying into not spam or spam.
Image classification: predictions through analysis of pixel images.
Personalized medical diagnosis: input of indicators like temperature, x-ray analysis, medical tests, for a disease classifier model, that predicts healthy, cold, flu, pneumonia etc.
And the last, the application for reading minds, with brain images that, applied to a model classifier it is possible to discover which image is seeing by the person.
– Need changes to Java to simplify parallel coding.
– Lambda expressions simplify how to pass behavior as a parameter.
-Show the differences through Java basic code, inner classes and lambdas.
Non-functional (imperative) programming style versus functional.
Problem: external iteration.
After: more functional with inner classes;
And then: lambda approach, more concise, less code (error-prone), client logic is stateless, thread-safe.
The lambda expression provides the implementation of the abstract method. The type is the abstract method.
@FunctionalInterface -> Functional Interface = an interface with one abstract method; default doesn’t count. The equals also doesn’t count in therms of abstract method.
Variable assignment: Callable c = () -> process();
Method parameter: mew Thread(() -> process()).start();
Lambda expressions can be used anywhere the type is a functional interface.
– A functional interface has only one abstract method.
The lambda expression provides the implementation of the single abstract method of the functional interface.
Operation that takes a single value and return no result: String s -> System.out.println(s) .
Example: String s -> System.out.println(s);
Takes two values and returns no result.
Example: (k,v) -> System.out.println(“key: ” + k + “, value: ” + v);
The opposite of a Consumer. Doesn’t take any parameter and returns a value.
Example: ( ) -> createLogMessage();
Takes one argument, do something and returns a result.
Example: Student s -> s.getName();
Takes two arguments and returns a result.
Example: (String name, Student s) -> new Teacher(name, student);
Kind function: single argument and result of the same type.
Example: String s -> s.toLowerCase();
Specialised form of BiFunction: two arguments and a result, all of the same type.
Example: (String x, String y) -> { if (x.length() > y.length()) return x; return y; }
A boolean valued function of one argument:
Example: Student s -> s.graduationYear() == 2011
Takes two arguments
Example: (Student s, int minGrade) -> s.grade <= minGrade
FileFilter x = (File f) -> f.canRead();
FileFilter x = File::canRead;
Final or effective final.